I've had good luck over the years ordering covers from J. C. Whitney. They have several different quality/prices, and can make the covers for just about any car. Have gotten them for a LM Vair, but also for a 55 Nomad, and 67 Vette, a 72 2002 BMW, a 88 M5 BMW, etc.
Travis Payne 65 Monza coupe
Raleigh, NC 65 500 coupe